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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1018) Logistic Regression deadlocks
Date Sat, 12 Jul 2014 12:25:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14059764#comment-14059764
] 

Stephan Ewen commented on FLINK-1018:
-------------------------------------

Ah, i see. There are two issues here:

1) The pipeline breaker at the broadcast variable
2) The pipeline breaker at the cross.

I think (1) is fixed in the latest version.
Let me investigate (2).



> Logistic Regression deadlocks
> -----------------------------
>
>                 Key: FLINK-1018
>                 URL: https://issues.apache.org/jira/browse/FLINK-1018
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Markus Holzemer
>         Attachments: LogisticRegression.java
>
>
> We are currently running our implementation of logistic regression with batch gradient
descent on the cluster.
> Unfortunatelly for datasets > 1GB it seems to deadlock inside of the iteration. This
means the first iteration is never finished.
> The iteration does a map over all points, the map gets the iteration input as broadcast
variable. The result of the map is reduced and the result of the reducer (1 tuple) is crossed
with the iteration input.
> There should be no reason for the deadlock, since the data is still quite small compared
to the cluster size (4 nodes a 32GB). Also the datasize stays constant throughout the algorithm.
> Here is the generated plan. I will also attach the full algorithm.
> {code}
> {
> 	"nodes": [
> 	{
> 		"id": 2,
> 		"type": "source",
> 		"pact": "Data Source",
> 		"contents": "[([0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.0, 0.0, 0.",
> 		"parallelism": "1",
> 		"subtasks_per_instance": "1",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "(unknown)" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "0.0 B" },
> 			{ "name": "Disk I/O", "value": "0.0 B" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "0.0 B" },
> 			{ "name": "Cumulative Disk I/O", "value": "0.0 B" },
> 			{ "name": "Cumulative CPU", "value": "0.0 " }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"step_function": [
> 	{
> 		"id": 8,
> 		"type": "source",
> 		"pact": "Data Source",
> 		"contents": "TextInputFormat (hdfs://cloud-7:45010/tmp/input/higgs.M.txt) - UTF-8",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "8.0.31 GB" },
> 			{ "name": "Est. Cardinality", "value": "109.90 M" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "0.0 B" },
> 			{ "name": "Disk I/O", "value": "8.0.31 GB" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "0.0 B" },
> 			{ "name": "Cumulative Disk I/O", "value": "8.0.31 GB" },
> 			{ "name": "Cumulative CPU", "value": "0.0 " }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 7,
> 		"type": "pact",
> 		"pact": "Map",
> 		"contents": "de.tu_berlin.impro3.stratosphere.classification.logreg.LogisticRegression$6",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"predecessors": [
> 			{"id": 8, "ship_strategy": "Forward"}
> 		],
> 		"driver_strategy": "Map",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "109.90 M" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "0.0 B" },
> 			{ "name": "Disk I/O", "value": "0.0 B" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "0.0 B" },
> 			{ "name": "Cumulative Disk I/O", "value": "8.0.31 GB" },
> 			{ "name": "Cumulative CPU", "value": "0.0 " }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 11,
> 		"type": "pact",
> 		"pact": "Map",
> 		"contents": "de.tu_berlin.impro3.stratosphere.classification.logreg.LogisticRegression$1",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"predecessors": [
> 			{"id": 7, "ship_strategy": "Forward"}
> 		],
> 		"driver_strategy": "Map",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "109.90 M" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "0.0 B" },
> 			{ "name": "Disk I/O", "value": "0.0 B" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "0.0 B" },
> 			{ "name": "Cumulative Disk I/O", "value": "4.0.15 GB" },
> 			{ "name": "Cumulative CPU", "value": "0.0 " }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 10,
> 		"type": "pact",
> 		"pact": "Reduce",
> 		"contents": "de.tu_berlin.impro3.stratosphere.classification.logreg.LogisticRegression$2",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"predecessors": [
> 			{"id": 11, "ship_strategy": "Forward"}
> 		],
> 		"driver_strategy": "Reduce All",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "109.90 M" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "0.0 B" },
> 			{ "name": "Disk I/O", "value": "0.0 B" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "0.0 B" },
> 			{ "name": "Cumulative Disk I/O", "value": "4.0.15 GB" },
> 			{ "name": "Cumulative CPU", "value": "0.0 " }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 9,
> 		"type": "pact",
> 		"pact": "Reduce",
> 		"contents": "de.tu_berlin.impro3.stratosphere.classification.logreg.LogisticRegression$2",
> 		"parallelism": "1",
> 		"subtasks_per_instance": "1",
> 		"predecessors": [
> 			{"id": 10, "ship_strategy": "Redistribute"}
> 		],
> 		"driver_strategy": "Reduce All",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "(unknown)" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "(unknown)" },
> 			{ "name": "Disk I/O", "value": "0.0 B" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "(unknown)" },
> 			{ "name": "Cumulative Disk I/O", "value": "4.0.15 GB" },
> 			{ "name": "Cumulative CPU", "value": "0.0 " }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 12,
> 		"type": "pact",
> 		"pact": "Bulk Partial Solution",
> 		"contents": "Partial Solution",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "(unknown)" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "0.0 B" },
> 			{ "name": "Disk I/O", "value": "0.0 B" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "0.0 B" },
> 			{ "name": "Cumulative Disk I/O", "value": "0.0 B" },
> 			{ "name": "Cumulative CPU", "value": "0.0 " }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 6,
> 		"type": "pact",
> 		"pact": "Map",
> 		"contents": "de.tu_berlin.impro3.stratosphere.classification.logreg.LogisticRegression$3",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"predecessors": [
> 			{"id": 7, "side": "first", "ship_strategy": "Forward", "temp_mode": "CACHED"},
> 			{"id": 9, "side": "second", "ship_strategy": "Broadcast"},
> 			{"id": 12, "side": "second", "ship_strategy": "Broadcast"}
> 		],
> 		"driver_strategy": "Map",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "109.90 M" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "0.0 B" },
> 			{ "name": "Disk I/O", "value": "(unknown)" },
> 			{ "name": "CPU", "value": "(unknown)" },
> 			{ "name": "Cumulative Network", "value": "(unknown)" },
> 			{ "name": "Cumulative Disk I/O", "value": "(unknown)" },
> 			{ "name": "Cumulative CPU", "value": "(unknown)" }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 5,
> 		"type": "pact",
> 		"pact": "Reduce",
> 		"contents": "de.tu_berlin.impro3.stratosphere.classification.logreg.LogisticRegression$4",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"predecessors": [
> 			{"id": 6, "ship_strategy": "Forward"}
> 		],
> 		"driver_strategy": "Reduce All",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "109.90 M" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "0.0 B" },
> 			{ "name": "Disk I/O", "value": "0.0 B" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "(unknown)" },
> 			{ "name": "Cumulative Disk I/O", "value": "(unknown)" },
> 			{ "name": "Cumulative CPU", "value": "(unknown)" }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 4,
> 		"type": "pact",
> 		"pact": "Reduce",
> 		"contents": "de.tu_berlin.impro3.stratosphere.classification.logreg.LogisticRegression$4",
> 		"parallelism": "1",
> 		"subtasks_per_instance": "1",
> 		"predecessors": [
> 			{"id": 5, "ship_strategy": "Redistribute"}
> 		],
> 		"driver_strategy": "Reduce All",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "(unknown)" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "(unknown)" },
> 			{ "name": "Disk I/O", "value": "0.0 B" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "(unknown)" },
> 			{ "name": "Cumulative Disk I/O", "value": "(unknown)" },
> 			{ "name": "Cumulative CPU", "value": "(unknown)" }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 3,
> 		"type": "pact",
> 		"pact": "Cross",
> 		"contents": "de.tu_berlin.impro3.stratosphere.classification.logreg.LogisticRegression$5",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"predecessors": [
> 			{"id": 4, "side": "first", "ship_strategy": "Broadcast"},
> 			{"id": 12, "side": "second", "ship_strategy": "Forward", "temp_mode": "PIPELINE_BREAKER"}
> 		],
> 		"driver_strategy": "Nested Loops (Blocked Outer: de.tu_berlin.impro3.stratosphere.classification.logreg.LogisticRegression$4)",
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "(unknown)" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "(unknown)" },
> 			{ "name": "Disk I/O", "value": "(unknown)" },
> 			{ "name": "CPU", "value": "(unknown)" },
> 			{ "name": "Cumulative Network", "value": "(unknown)" },
> 			{ "name": "Cumulative Disk I/O", "value": "(unknown)" },
> 			{ "name": "Cumulative CPU", "value": "(unknown)" }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	}
> 		],
> 		"partial_solution": 12,
> 		"next_partial_solution": 3,
> 		"id": 1,
> 		"type": "bulk_iteration",
> 		"pact": "Bulk Iteration",
> 		"contents": "Bulk Iteration",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"predecessors": [
> 			{"id": 2, "ship_strategy": "Redistribute"}
> 		],
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "(unknown)" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "(unknown)" },
> 			{ "name": "Disk I/O", "value": "(unknown)" },
> 			{ "name": "CPU", "value": "(unknown)" },
> 			{ "name": "Cumulative Network", "value": "(unknown)" },
> 			{ "name": "Cumulative Disk I/O", "value": "(unknown)" },
> 			{ "name": "Cumulative CPU", "value": "(unknown)" }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	},
> 	{
> 		"id": 0,
> 		"type": "sink",
> 		"pact": "Data Sink",
> 		"contents": "TextOutputFormat (hdfs://cloud-7:45010/tmp/output/logreg) - UTF-8",
> 		"parallelism": "64",
> 		"subtasks_per_instance": "16",
> 		"predecessors": [
> 			{"id": 1, "ship_strategy": "Forward"}
> 		],
> 		"global_properties": [
> 			{ "name": "Partitioning", "value": "RANDOM" },
> 			{ "name": "Partitioning Order", "value": "(none)" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"local_properties": [
> 			{ "name": "Order", "value": "(none)" },
> 			{ "name": "Grouping", "value": "not grouped" },
> 			{ "name": "Uniqueness", "value": "not unique" }
> 		],
> 		"estimates": [
> 			{ "name": "Est. Output Size", "value": "(unknown)" },
> 			{ "name": "Est. Cardinality", "value": "(unknown)" }		],
> 		"costs": [
> 			{ "name": "Network", "value": "0.0 B" },
> 			{ "name": "Disk I/O", "value": "0.0 B" },
> 			{ "name": "CPU", "value": "0.0 " },
> 			{ "name": "Cumulative Network", "value": "(unknown)" },
> 			{ "name": "Cumulative Disk I/O", "value": "(unknown)" },
> 			{ "name": "Cumulative CPU", "value": "(unknown)" }
> 		],
> 		"compiler_hints": [
> 			{ "name": "Output Size (bytes)", "value": "(none)" },
> 			{ "name": "Output Cardinality", "value": "(none)" },
> 			{ "name": "Avg. Output Record Size (bytes)", "value": "(none)" },
> 			{ "name": "Filter Factor", "value": "(none)" }		]
> 	}
> 	]
> }
> {code}



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